The simplest electric circuit consists of a source of e.m.f. (such as cell or battery) and a device, which may be a resistor, capacitor, inductor or a combination of these. The source of e.m.f. supplies electrical energy to the circuit, which is consumed or transformed into other forms by resistor, inductor and capacitor.
In this chapter we will study direct current (d.c.) circuits, in which the direction of the current does not change with time. In d.c. circuits with resistors only, the magnitude of current does not change with time whereas, in d.c. circuits containing capacitors and inductors, the magnitude of current may change with time.
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